SNVS323I December   2004  – February 2016 LP38690-ADJ , LP38692-ADJ

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Foldback Current Limiting
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable Pin (LP38692-ADJ Only)
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Reverse Voltage
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Setting The Output Voltage
        2. 8.2.2.2 External Capacitors
          1. 8.2.2.2.1 Input Capacitor
          2. 8.2.2.2.2 Output Capacitor
          3. 8.2.2.2.3 Selecting A Capacitor
            1. 8.2.2.2.3.1 Ceramic
            2. 8.2.2.2.3.2 Tantalum
        3. 8.2.2.3 RFI/EMI Susceptibility
        4. 8.2.2.4 Output Noise
        5. 8.2.2.5 Power Dissipation
        6. 8.2.2.6 Estimating Junction Temperature
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 WSON Mounting
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Related Links
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Input Voltage Range: 2.7 V to 10 V
  • Output Voltage Range: 1.25 V to 9 V
  • 2.5% Adjust Pin Voltage Accuracy (25°C)
  • Low Dropout Voltage: 450 mV at 1 A (5-V Typical VOUT)
  • Precision (Trimmed) Bandgap Reference
  • Ensured Specs for –40°C to +125°C
  • 1-µA Off-State Quiescent Current
  • Thermal Overload Protection
  • Foldback Current Limiting
  • Enable (EN) Pin (LP38692-ADJ)
  • 5-Pin SOT-223 and 6-Pin WSON Packages

2 Applications

  • Hard Disk Drives
  • Notebook Computers
  • Battery-Powered Devices
  • Portable Instrumentation

3 Description

The LP38690-ADJ and LP38692-ADJ low dropout CMOS linear regulators provide 2.5% precision reference voltage, extremely low dropout voltage (450 mV at 1-A load current, VOUT = 5 V) and excellent AC performance utilizing ultralow equivalent series resistance (ESR) ceramic output capacitors.

The low thermal resistance of the WSON and SOT-223 packages allow the full operating current to be used even in high ambient temperature environments.

The use of a PMOS power transistor means that no DC base drive current is required to bias it allowing ground pin current to remain below 100 µA regardless of load current, input voltage, or operating temperature.

  • Dropout Voltage: 450 mV (typical) at 1 A (typical 5-V out)
  • Ground Pin Current: 55 µA (typical) at full load
  • Adjust Pin Voltage: 2.5% (25°C) accuracy

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LP38690-ADJ WSON (6) 3.00 mm × 3.00 mm
LP38692-ADJ
LP38692-ADJ SOT-223 (5) 6.50 mm × 3.56 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic LP38690-ADJ

LP38690-ADJ LP38692-ADJ 20126701.gif

Simplified Schematic LP38692-ADJ

LP38690-ADJ LP38692-ADJ 20126702.gif
VOUT = VADJ × (1 + R1/R2)